CA2299053A1 - A method of detecting objects within range of a receiver - Google Patents

A method of detecting objects within range of a receiver Download PDF

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Publication number
CA2299053A1
CA2299053A1 CA002299053A CA2299053A CA2299053A1 CA 2299053 A1 CA2299053 A1 CA 2299053A1 CA 002299053 A CA002299053 A CA 002299053A CA 2299053 A CA2299053 A CA 2299053A CA 2299053 A1 CA2299053 A1 CA 2299053A1
Authority
CA
Canada
Prior art keywords
receiver
range
detecting objects
detecting
supervisory
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002299053A
Other languages
French (fr)
Other versions
CA2299053C (en
Inventor
Brian Martin
Jennifer Mckenzie
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xmark Corp
Original Assignee
Instantel Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Instantel Inc filed Critical Instantel Inc
Publication of CA2299053A1 publication Critical patent/CA2299053A1/en
Application granted granted Critical
Publication of CA2299053C publication Critical patent/CA2299053C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2465—Aspects related to the EAS system, e.g. system components other than tags
    • G08B13/2488—Timing issues, e.g. synchronising measures to avoid signal collision, with multiple emitters or a single emitter and receiver
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2451—Specific applications combined with EAS
    • G08B13/2462—Asset location systems combined with EAS
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B26/00—Alarm systems in which substations are interrogated in succession by a central station
    • G08B26/007—Wireless interrogation

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Computer Security & Cryptography (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

A method of detecting a variable number of objects within range of a receiver, is comprised of transmitting from each object a supervisory message from time to time, detecting the supervisory message by the receiver over a detection interval, and varying the detection interval based on a number of objects under supervision and the probability of collisions of the supervisory messages.
CA002299053A 1999-10-12 2000-02-21 A method of detecting objects within range of a receiver Expired - Fee Related CA2299053C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/416,534 US6727810B1 (en) 1999-10-12 1999-10-12 Method of detecting objects within range of a receiver
US09/416,534 1999-10-12

Publications (2)

Publication Number Publication Date
CA2299053A1 true CA2299053A1 (en) 2001-04-12
CA2299053C CA2299053C (en) 2008-02-05

Family

ID=23650347

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002299053A Expired - Fee Related CA2299053C (en) 1999-10-12 2000-02-21 A method of detecting objects within range of a receiver

Country Status (2)

Country Link
US (1) US6727810B1 (en)
CA (1) CA2299053C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005071634A2 (en) * 2004-01-27 2005-08-04 Richard Turner Method and apparatus for detection and tracking of objects within a defined area

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1666218A (en) * 2002-06-06 2005-09-07 成套仪器公司 Method and system for selectively monitoring activities in a tracking environment
US7088242B2 (en) * 2003-09-16 2006-08-08 International Business Machines Corporation Collective personal articles tracking
US20050184150A1 (en) * 2004-02-24 2005-08-25 Welte Gregory A. Device to prevent credit card loss
US7365645B2 (en) * 2005-01-26 2008-04-29 Rf Technologies, Inc. Mobile locator system and method with wander management
WO2006130754A2 (en) * 2005-06-02 2006-12-07 Carttronics, Llc Tracking system and method
US20060290519A1 (en) * 2005-06-22 2006-12-28 Boate Alan R Two-way wireless monitoring system and method
US7710256B2 (en) * 2006-02-23 2010-05-04 Honeywell International Inc. Method and apparatus for audio assisted testing
JP2007302188A (en) * 2006-05-15 2007-11-22 Nippon Soken Inc Tire air pressure detection device
US20090063176A1 (en) * 2007-08-31 2009-03-05 French John R Shopping cart basket monitor
US20090179760A1 (en) * 2008-01-10 2009-07-16 Nebolon Joseph F Caster system activator
US20090268941A1 (en) * 2008-04-23 2009-10-29 French John R Video monitor for shopping cart checkout
US20100127874A1 (en) * 2008-11-21 2010-05-27 Curtis Guy P Information locator
US8998218B1 (en) 2013-10-09 2015-04-07 Steven Salvatore Bitondo Shopping cart bottom shelf monitor
EP3945449A1 (en) * 2020-07-27 2022-02-02 Nxp B.V. Rfid transponder having modifiable settings

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5640151A (en) * 1990-06-15 1997-06-17 Texas Instruments Incorporated Communication system for communicating with tags
US5887176A (en) * 1996-06-28 1999-03-23 Randtec, Inc. Method and system for remote monitoring and tracking of inventory

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005071634A2 (en) * 2004-01-27 2005-08-04 Richard Turner Method and apparatus for detection and tracking of objects within a defined area
WO2005071634A3 (en) * 2004-01-27 2006-08-17 Richard Turner Method and apparatus for detection and tracking of objects within a defined area
US7692530B2 (en) 2004-01-27 2010-04-06 Turner Richard H Identification and tracking of information stored on radio frequency identification devices
EP2259240A1 (en) * 2004-01-27 2010-12-08 Richard Harry Turner Method and apparatus for detection and tracking of objects within a defined area
CN101027700B (en) * 2004-01-27 2012-03-21 理查德·特纳 Method and apparatus for detection and tracking of objects within a defined area

Also Published As

Publication number Publication date
CA2299053C (en) 2008-02-05
US6727810B1 (en) 2004-04-27

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed

Effective date: 20200221